Ink cartridge



FIG. 1 is a front, left side and bottom perspective view of an ink cartridge showing my new design;

FIG. 2 is a rear, right side and top perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom view thereof. 

The ornamental design for an ink cartridge, as shown and described. 